** Tags added: verification-done-jammy -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-6.0 in Ubuntu. https://bugs.launchpad.net/bugs/2023638
Title: Various backlight issues with the 6.0/6.1 kernel Status in HWE Next: New Status in linux package in Ubuntu: In Progress Status in linux-oem-6.0 package in Ubuntu: Invalid Status in linux-oem-6.1 package in Ubuntu: Invalid Status in linux source package in Jammy: Invalid Status in linux-oem-6.0 source package in Jammy: Fix Committed Status in linux-oem-6.1 source package in Jammy: In Progress Status in linux source package in Kinetic: Invalid Status in linux-oem-6.0 source package in Kinetic: Invalid Status in linux-oem-6.1 source package in Kinetic: Invalid Status in linux source package in Lunar: In Progress Status in linux-oem-6.0 source package in Lunar: Invalid Status in linux-oem-6.1 source package in Lunar: Invalid Status in linux source package in Mantic: In Progress Status in linux-oem-6.0 source package in Mantic: Invalid Status in linux-oem-6.1 source package in Mantic: Invalid Bug description: [Impact] There are some new patches for new method to decide which backlight driver should be registered introduced since 6.1. And we backport some of them to 6.0-oem kernel which are not enough to solved all backlight issues. 1. dell_laptop created a non-working backlight driver before nvidia is loaded, that leads to the system can't adjust the display brightness. 2. acpi_backlight0 sometimes will be generated together with intel_backlight. [Fix] Below 2 commits from v6.3-rc6 prevent the acpi_backlight from being registered automatically(which have been included into ubuntu kernels through stable update) e506731c8f35 ACPI: video: Make acpi_backlight=video work independent from GPU driver 78dfc9d1d1ab ACPI: video: Add auto_detect arg to __acpi_video_get_backlight_type() Below patch prevents platform driver(dell_laptop) from creating backlight driver after win8. aa8a950a5d6b ACPI: video: Stop trying to use vendor backlight control on laptops from after ~2012 https://patchwork.kernel.org/project/linux-acpi/patch/20230608091258.7963-1-hdego...@redhat.com/ [Test] Verified on the dell platform which reports this issue. [Where problems could occur] The assumption of the not-yet-upstreamed commit regarding backlight control is that, after Windows 8, all laptop backlights are controlled either by ACPI or the native graphics driver. It impacts the laptops that do not follow the assumption and will lead to broken backlight interface. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2023638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
